Screen



Dec. 19, 1939.

L. G. SYMONS SCREEN Filed Sept. l2, 1936 2 Sheets-Sheet 1 f/fye/e fr laffe/2 L'yea/s' y L, G. SYMONS Dec. 19, 1939.

SCREEN Filed Sept. 12, 1956 2 Sheets-Sheet 2 y a y y f w@ J -M L@ @20v Patented Dec. 19, 1939 PA-Tia"NTv oFFlcE somma` Loren G.`Symo1 is, Hollywood, Calif., assigner to Nordberg Manufacturing Company, Milwauykee, Wis., a corporation of. Wisconsin Application september 12, 193s, serial No. 10am acum (ci zoe-40s) My inventionI relates to an improvement in screens and means for supporting them.

One purposev is the-.provision `ofmeans for limiting ror eliminating thetransmission of vi- 5 bration from av vibrating screen tothe supporting structure for said screen.

y yAnother purpose'is the provision of improved Imeans for permitting a slight vibration of the main frame lof the screen, in response to the normal operation of the screen, while preventing the transmission of such vibration to the base or supporting structure.

Another purpose is the provision of improved means for permitting slight vibration of the l screen main frame, while preventing any substantial movement of misalinement of the main frame. Other purposes will become evident from a reading of the specication and claims.

o I illustrate my invention more or less diagrammatically in the accompanying drawings wherein:

Figure 1 is a side elevation with parts broken away and parts in section;

Figure 2 is an enlarged end view with parts shown in section, the parts in section being taken substantially on the line 2-2 of Figure 1;

Y Figure 3 is an enlarged detail section taken on line 3-3 of Figure 1; and

Figure 4 is a section taken on the line 4-4 of Figure 3.

Like reference characters refer to like parts throughout the specification and drawings.

Referring to the drawings, I generally .indicates any suitable base or foundation structure which may be of concrete, wooden beams, metal beams or the like. foundation structure, I illustrate a plurality of brackets generally indicated as 2, each one provided with a bottom web or ange, an upstanding flange 4, with reinforcing webs 5, which support an upwardly and inwardly inclined spring seat or platform 6.

I0, |Il indicate the channel members which,

together with any suitable transverse supports Il, form the base or main frame of the vibratory screen. I2, I2 indicate guiding and supportin g pins each shown with a bottom .head I3 and an upper spring abutment I4, and a secur'- ing and adjusting nut I5. I6 indicates a generally spherically faced supporting member forming a part of the head I3. Interposed between it and the. bottom of the channel flange isa concave spherical member Il. If desired, the concave '55 spherical member I1 may be of yielding ma- Mounted upon this base or terial, such as rubber, but is shown as oi metal.

The pins I2 pass through apertures Il in the channel members ill and apertures I3 in the spring seats 6 which are of suillcient size to give slight clearance, whereby a limited but sufhcient 5 ilexure or lateral movement of the pins |2 is permitted. 20 indicates coil springs compressed between the upper surfaces of the platform 6 and the lower faces of the abutment members or washers Il. The pins may be surrounded by 10 short rubber sleeves 2| to prevent metal to metal contact between the pins I2 and 'spring seats 6 during vibration of the below described screen structure. The brackets may be made single as illustrated, but, if desired, may be made 15 as double with two pins and springs associated with each bracket. Any desired number of said brackets may be spaced along each of the main frames or channels I0.

The screen structure mounted upon the main .o frame may, of course, be varied but I illustrate as an advantageous structure for employment with this type of support the structure below described. It may include, for example, a screen frame, generally indicated as 25, with any suitable screen cloth'26 thereon. The screen 25 may be supported for example by a plurality of leaf springs 21, secured in any suitable fashion to the inner faces of the channel members I2. A feed box 28 is shown at the feed end of the screen. 30 Positioned along the side of the screen are weight bars 29, independently mounted upon the main frame channel members I0 by inclined leaf springs 30. The inclined springs supporting the weight members and the screen are shown as u parallel with each other and as spaced along the channel members l0 at intervals. 3| indicates any suitable motor with a pulley 32 driving abelt 33, passing around a pulley 34, associated with a rotor structure the details of which are not herein indicated. It will be understood, however, that an eccentric is included as shown at 35 and that the rotationof the rotor varies effective distances between its axis of rotation and the screen 25. As a cona nection between the rotor structure with its attached weights and the screen 25, I illustrate a plurality of leaf springs 40, lsome being positioned above and some below the axis of rotation of the rotor 35.

It will be understood that, in response to the rotation of the motor 3|, the rotor is rotated at a high rate of speed which may for example be in the neighborhood of 1500 to 2000 R. P. M., more or less. In response to this rotation, the

effective distance between the rotor and the screens 26 is varied and the screens are rapidly vibrated upon the inclined springs 21. At the same time. the weights and the rotor structure are vibrated upon their own supporting springs 3U, both the screens 26 and the rotor structure being thus ilexibly iloated upon the channel members l0 of the main frame of the screen.

Very little vibration is transmitted to the mainA me to the precise showing.

I claim:

l. In a screening device, a normally fixed base, an intermediate frame member positioned above said base, a plurality of yielding supporting connections between said base and said intermediate frame member, alined along a pair of opposite sides only of said frame member. said yielding connections including outwardly inclined stems secured to said intermediate frame member,

abutments on said base. and coil sprius surroundingsaidstems andcompreesedasainstsaid abutmenta, whereby a substantially longitudinal vibratory movement of the intermediate frame member in relation to the base. and relative ves'- tical movement of the frame member in relation tothebasearepemxitted. sscreen deekyieldably mounted on said intermediate frame member for longitudinal vibratory movement in. relation thereto, and means for vibrating said screen deck.

2. In a screening device, a normally xed base. an intermediate frame member positioned above said base, a plurality of yielding supporting oonnections between said base and said intermedil ate frame member, aligned along a pair of opposite sides only ot said frame member. said yielding connections including stems secured to said intermediate frame member, abutments on said base, and coil springs surrounding said stems i and compressed against said abutments. whereby a substantially longitudinal vibratory movement of the intermediate frame member in relation to the base, and relative vertical movement of the frame member in relation to the base are i permitted, a screen deck yieldabiy mounted on said intermediate frame member for longitudinal vibratory movement in relation thereto, and means for vibrating said screen deck.

HOREN G. S'YMONS. I 

